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Biology · 2025 · 5 marks
CBSE 2025 · Region 5 · Set 1 · Q32
(a) (i) Describe the population growth curve applicable in a population of any species in nature that has unlimited resources at its disposal. (ii)…
(i)
Describe the population growth curve applicable in a population of any species in nature that has unlimited resources at its disposal.
(ii)
Explain the equation of this growth curve.
(iii)
Name the growth curve and depict a graphical plot for this type of population growth.
(i)
Explain the conclusion drawn by Alexander von Humboldt during his extensive explorations in the wilderness of South American jungles.
(ii)
Give the equation of the Species-Area relationship.
(iii)
Draw a graphical representation of the relation between species richness and area for a wide variety of taxa such as birds, bats, etc.
Marking-scheme solution
(i)
When resources in the habitat are unlimited each species has the ability to realize fully
its innate potential to grow in number, the population grow in an exponential or geometric fashion, It results in a J-shaped curve when we plot population density in relation to time.
(ii)
dN/dt = (b – d) xN / dN/dt = rN / Nt = N0ert
r = intrinsic rate of natural increase
N = size of the population
b = birth rate
d = death rate
(iii)
Exponential growth curve
(i)
Within a region species richness increases with increasing explored area, but only up
to a limit
(ii)
log S = log C + $\displaystyle 2$ log A / S = CAZ
(iii)
log S = log C + Z log A / S = CA^Z (log-log scale).
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.